Massachusetts has retail choice but, similar to New York, the AG's office has documented that competitive supply customers paid $577M more than basic service customers from 2015–2021. Eversource and National Grid's default 'Basic Service' is set by auction and is hard to beat. Most MA customers should stay on basic service or join their town's municipal aggregation.
Check whether your town has municipal aggregation — these programs often beat basic service AND the competitive market.
Compare any competitive offer to your utility's CURRENT basic service rate (it changes Jan and Jul).
Reject all variable-rate plans.
If you're already on a competitive supply contract, it's free to switch back to basic service.
When you switch suppliers, your delivery utility doesn't change — they still maintain the wires and respond to outages. Only the energy charge on your bill changes.